Pete Bax - Mechanical Sound Effects

This is generally called an oil derrick and is a complex set of machines specifically designed for optimum efficiency, safety and low cost. This is used on offshore oil and gas rigs. It is currently in huge demand with over one million rigs in USA and more out to sea. Now going in the UK. Mechanical Sound Effects, Pumping

The Doppler effect (or Doppler shift) is the change in frequency of a wave (or other periodic event) for an observer moving relative to its source. It is named after the Austrian physicist Christian Doppler, who proposed it in 1842 in Prague. Commonly heard when a train passes a stationary person, Mechanical Sound Effects, Engines / big engines